(UK, Australia, Canada, New Zealand, informal) A child.
1984 September 13, Donald Gould, Forum: Suck it and see, page 54,To test this hypothesis further, he and his mate Fifer persuaded 16 women, heavy with child, to read a story called The Cat in the Hat to their unborn sprogs, twice a day, during the last few weeks of their pregnancies.
2008, Julian Knight, Wills, Probate, & Inheritance Tax For Dummies, UK Edition, unnumbered page,Any guardianship or trusts that you set up when your children were little sprogs may no longer be needed.
2010, Brett Atkinson, Sarah Bennett, Scott Kennedy, New Zealand′s South Island, Lonely Planet, page 220,Kids will love the climbing wall and NZ′s highest vertical slide. If the sprogs get bored with reality, movie make-believe (p232) is right next door.